ARCHIVED REPORTS_XR0012715 - Laserfiche WebLink

Home Browse Search

� "' c ��-.��.�•r�.. €�,y_.�3 -��°"._:F ��,�,� �-'�,rn*�.."`�.. '�'� '�t� F �� ' "a'.-xs 9. :��- �.m ��Y:x'�f��' �.�.e� �." �i :. �� -u., � r.-_. .r.F�:.zZr� :. ��«'r`.`'s+',. .ate 4.'�.s'.k,% .=�-a ;.-..Sk�•. ''. ~ ?•�.�L�: � 3-.-,'Yt,.;�n. �:" �.�,ssi �, �"t�-.'t��`3I"i �� e' � -e�s':�� '� z - I the, relatively dense soil, the local implementing Agency inspector dacides not to have the interface soil sampled and han the bnckhoe dig deeper 10 sg:a If the contnminntion diminishes to acceptable levels. This exploration nnvrn the property owner the cunt of running two nomplea at that location, and onabien the Inapactor to directiy observe the condition of the danpar soil. In both exrmples, different material €n collected in lieu of a standard RWQCIi interface aample. Purthar, the materinl collected in substnntinlly different from what would have boon obtained by taking representative Boil at the Board specified sampling location. Note that both of there samples were taken at the direction of the local implementing agency inspector who wan present at the site and elected to select alternative sampling locations. Note too, that these alternative samples may provide more information about the site than standard Board specified samples. However, as the LIA elected samples do not accurately reflect soil conditions at the sampling points specified by the RWQCB, the decision making process may be hampered. s Clearly there is no advantage In limiting the ability of the regulator in the field to make prudent judgements. Likewise, regulatory personnel and consultants who will review the reports without benefit of having been present at the site need to know that the samples taken were not obtained at the standard locations. A Mmpls resolution to these situations Is a brief notation indicating that the aampling was elective rather than In accordance t with a standard Board specification. Theme notations appear in the third r column or the TABLE OF SAMPLING LOCATIONS AND ANALYTICAL RESULTS. By referring to the notations in column three and four in the TABLE, any ` party reviewing the report should be able to determine if something other than Board standard samples were obtained, and when variant sampling was performed, clarify whether it was elected by the LIA inspector, elected by our field personnel, or the result of some physical condition at the site that made it impossible to obtain material from the correct sampling location. SAMPLING METHODOLOGIES USED ON THIS PROJECT �.. STANDARD RWQCH INTERFACE SAMPLE: The tank removal sampling followed the standard protocol for obtaining Interface samples. These samples fall into the category of samples which are known to be of primary concern to the Interested regulatory agencies for determining if additional action will be required at a site and the methodology has been closely defined in State and r RWQCB publications, supplements, and presentations. These specify both the acceptable depth and lateral situation of sample collection points. In accordance with these specifications, sample collection in executed as close — - an _pcoulble to the center line_{longitudinal_axisl_of_the tank_and_an_n ___ vertical axis with the fill pipe. A corresponding location Is also found at the apposite end of the leek whenever standard interface samples are being collected. Briefly, the method consists of digging up native soil from directly below the fill pipe and the corresponding opposite and of the tank and obtaining a . Sampling Report 88057-C-1 Chevron 1918 SUCTION TWO/page 8 { Al